I used 66 full size Ford 289 exhaust manifolds on the 351 in my Ranger, I suspect 289 hipo manifolds would have fit, too, and would flow better. My friend used the Advance Adapters headers and they look like crap. I hollowed out my core support and used a Griffin radiator to get room enough for a fan using Fox body pulleys. I found out afterwards that T bird or Explorer front drive systems are shorter. Look around here, someone has done whatever you're planning. Diesel Rangers were rare because few people bought them, we never sold one but a couple came in our shop. Rare doesn't mean good or valuable, it means there aren't many. I'm not a "rare" or "matching numbers" guy, I want things to work right, original be damned.